<template>
	<view>
    <!-- 使用自定义搜索组件 -->
    <my-search @click="gotoSearch"></my-search>
		<view class="sroll-view-container">
      <!-- 左侧滚动视图 -->
      <scroll-view class="left-scoll-view" scroll-y="true" :style="{height: wh + 'px' }">
        <block v-for="(item, i) in cateList" :key="i">
          <view :class="['left-scoll-item', active === i ? 'active':'']" @click="activeChanged(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧滚动视图 -->
      <scroll-view class="right-scoll-view" scroll-y="true" :style="{height: wh + 'px' }" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
          <!-- 二级标题的分类 -->
          <view class="cate-lv2-item">
            / {{item2.cat_name}} /
          </view>
          <!-- 当前二级分类下的三级分类列表 -->
          <view class="cate-lv3-list">
            <!-- 三级分类的Item项 -->
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodList(item3)">
              <!-- 三级分类的图片 -->
              <image :src="item3.cat_icon"></image>
              <!-- 三级分类的文字 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
	</view>
</template>

<script>
  import badgeMix from '@/mixins/tabber-badge.js'
  
	export default {
    mixins: [badgeMix],
		data() {
			return {
        // 窗口的可用高度
				wh: 0,
        // 分类数据列表
        cateList: [],
        active: 0,
        cateLevel2: [],
        scrollTop: 0
			};
		},
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods: {
      async getCateList() {
        const {data: res} = await uni.$http.get('/api/public/v1/categories')
        this.cateList = res.message
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(i) {
        this.active = i
        this.cateLevel2 = this.cateList[i].children
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      gotoGoodList(item) {
        uni.navigateTo({
          url: '/subpkg/good_list/good_list?cid=' + item.cat_id
        })
      },
      gotoSearch() {
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      }
    }
	}
</script>

<style lang="scss">
.sroll-view-container {
  display: flex;
  .left-scoll-view {
    width: 120px;
    
    .left-scoll-item {
      line-height: 60px;
      background-color: #F7F7F7;
      text-align: center;
      font-size: 12px;
      
      // 激活项的样式
      &.active {
        background-color: #FFFFFF;
        position: relative;
        
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
}

.cate-lv2-item {
  font-size: 12px;
  font-weight: blod;
  text-align: center;
  padding: 15px 0;
}

.cate-lv3-list {
    display: flex;
    flex-wrap: wrap;
    
    .cate-lv3-item {
      width: 33.33%;
      margin-bottom: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      
      image {
        width: 60px;
        height: 60px;
      }
      text {
        font-size: 12px;
      }
      

    }
  }
</style>
